/*
 * @(#)TimeUtil.java	1.0 Mar 7, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.util;

import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static java.util.concurrent.TimeUnit.MICROSECONDS;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import java.util.concurrent.*;
import java.util.*;

public class TimeUtil
{
	public static Unit Nanosecond = Unit.Nanosecond;
	public static Unit Microsecond = Unit.Microsecond;
	public static Unit Millisecond = Unit.Millisecond;
	public static Unit Centisecond = Unit.Centisecond;
	public static Unit Second = Unit.Second;
	public static Unit Minute = Unit.Minute;
	public static Unit Hour = Unit.Hour;
	public static Unit Day = Unit.Day;

	public enum Unit
	{
		Nanosecond("ns",			NANOSECONDS, 	1),
		Microsecond('\u00B5' + "s", MICROSECONDS, 	1),
		Millisecond("ms",			MILLISECONDS, 	1),
		Centisecond("cs",			MILLISECONDS, 	10),
		Second(		"sec",			SECONDS, 		1),
		Minute(		"min",			SECONDS, 		60),
		Hour(		"hr",			SECONDS, 		60 * 60),
		Day(		"day",			SECONDS, 		60 * 60 * 24);

		Unit(String friendlyName, TimeUnit unit, long multiplier)
		{
			this.friendlyName = friendlyName;
			this.unit = unit;
			this.multiplier = multiplier;
		}
		protected String friendlyName;
		protected TimeUnit unit;
		protected long multiplier;

		public long convertFrom(long amount, Unit unitOfAmount)
		{
			if(unit.equals(unitOfAmount.unit))
				return amount * unitOfAmount.multiplier / multiplier;

			return unit.convert(amount * unitOfAmount.multiplier, unitOfAmount.unit) / multiplier;
		}

		public void sleep(long timeout)
		{
			try{
				unit.sleep(timeout * multiplier);
		    }catch(InterruptedException ie){
				// no-op
			}
		}

		public void timedJoin(Thread thread, long timeout)
		{
			try{
				unit.timedJoin(thread, timeout * multiplier);
		    }catch(InterruptedException ie){
				// no-op
			}
		}

		public void timedWait(Object obj, long timeout)
		{
			try{
				unit.timedWait(obj, timeout * multiplier);
		    }catch(InterruptedException ie){
				// no-op
			}
		}

		public String toString(long amount)
		{
			return String.format("%d %ss", amount, toString());
		}

		public String friendly(long amount)
		{
			return String.format("%d%s", amount, friendlyName);
		}
	}


	public static String friendly(long amount, Unit unitOfAmount, boolean includeCentiseconds)
	{
		long nanos = Nanosecond.convertFrom(amount, unitOfAmount);
		List<Unit> units = Arrays.asList(Unit.values());
		Collections.reverse(units);
		StringBuilder sb = new StringBuilder();
		for(Unit unit : units)
		{
			if((!includeCentiseconds) && unit.equals(Centisecond))
				continue;

			long unitAmount = unit.convertFrom(nanos, Nanosecond);
			nanos -= Nanosecond.convertFrom(unitAmount, unit);
			if(unitAmount > 0)
				sb.append(String.format("%s ", unit.friendly(unitAmount)));
		}

		return sb.toString().trim();
	}

	public static String unfriendly(long amount, Unit unitOfAmount, boolean includeCentiseconds)
	{
		long nanos = Nanosecond.convertFrom(amount, unitOfAmount);
		List<Unit> units = Arrays.asList(Unit.values());
		Collections.reverse(units);
		StringBuilder sb = new StringBuilder();
		for(Unit unit : units)
		{
			if((!includeCentiseconds) && unit.equals(Centisecond))
				continue;

			long unitAmount = unit.convertFrom(nanos, Nanosecond);
			nanos -= Nanosecond.convertFrom(unitAmount, unit);
			if(unitAmount > 0)
				sb.append(String.format("%s ", unit.toString(unitAmount)));
		}

		return sb.toString().trim();
	}
}
